Science H.W(25/4/17)

Dear Students,

Read to Comprehend: Read section 2.4 and discuss the answers of the following questions:

  1. Define pathogens.
  2. What are communicable diseases? Give three examples.
  3. What do you mean by carriers of disease? Name two such carriers and the disease they cause.
  4. List the measures which help to avoid the spread of malaria and dengue.
  5. List the general preventive measures that need to be adopted against the infection of cholera and typhoid.
  6. Name two diseases each in plants and animals caused by microbes.
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